Let
A
=
[
1
−
2
1
−
2
]
\displaystyle {A}={\left[\begin{array}{cc} {1}&-{2}\\{1}&-{2}\end{array}\right]}
A
=
[
1
1
−
2
−
2
]
. Find
det
A
\displaystyle {\det{{A}}}
det
A
.
det
A
=
\displaystyle {\det{{A}}}=
det
A
=
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